linux-kernel - Re: [PATCH v3] mm/memory_hotplug: Fix try_offline

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Date:   Tue, 5 Nov 2019 11:07:34 +0100
From:   David Hildenbrand <david@...hat.com>
To:     Masayoshi Mizuma <msys.mizuma@...il.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Tang Chen <tangchen@...fujitsu.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Keith Busch <keith.busch@...el.com>,
        Jiri Olsa <jolsa@...nel.org>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Jani Nikula <jani.nikula@...el.com>,
        Nayna Jain <nayna@...ux.ibm.com>,
        Michal Hocko <mhocko@...e.com>,
        Oscar Salvador <osalvador@...e.de>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Dan Williams <dan.j.williams@...el.com>,
        Pavel Tatashin <pasha.tatashin@...een.com>
Subject: Re: [PATCH v3] mm/memory_hotplug: Fix try_offline_node()

On 05.11.19 02:20, Masayoshi Mizuma wrote:
> 5.4-rc5 with this patch works for memory-hotadd and remove, thanks!
> Please feel free to add:
> 
>      Tested-by: Masayoshi Mizuma <m.mizuma@...fujitsu.com>
> 
> Without this patch, memory hotplug fails as panic:
> 
>   BUG: kernel NULL pointer dereference, address: 0000000000000000
>   ...
>   Call Trace:
>    remove_memory_block_devices+0x81/0xc0
>    try_remove_memory+0xb4/0x130
>    ? walk_memory_blocks+0x75/0xa0
>    __remove_memory+0xa/0x20
>    acpi_memory_device_remove+0x84/0x100
>    acpi_bus_trim+0x57/0x90
>    acpi_bus_trim+0x2e/0x90
>    acpi_device_hotplug+0x2b2/0x4d0
>    acpi_hotplug_work_fn+0x1a/0x30
>    process_one_work+0x171/0x380
>    worker_thread+0x49/0x3f0
>    kthread+0xf8/0x130
>    ? max_active_store+0x80/0x80
>    ? kthread_bind+0x10/0x10
>    ret_from_fork+0x35/0x40
> 
> - Masa

Thanks a lot for testing!

-- 

Thanks,

David / dhildenb